RESUMO
BACKGROUND: The increasing need for high precision in different aspects of clinical and diagnostic ophthalmology calls for a knowledge of the normative ocular biometric parameters. Since this may be affected by race, it is thus important to obtain more information in an effort to determine the African values.The main objective of this study is to determine the normal ocular biometric dimensions and their variation with age in a south western Nigerian population. STUDY DESIGN: A population-based descriptive cross-sectional study carried out in Sagamu Local Area of Ogun State, Nigeria. MATERIALS AND METHOD: A multi-staged cluster random sampling technique was used to select eligible participants who underwent ocular biometry between July and October 2010. RESULTS: Three hundred and two respondents aged 18 years and above underwent A-scanography and keratometry. The mean axial length, anterior chamber depth, lens thickness, vitreous chamber depth and cornea power were 23.31±0.91mm, 3.13±0.40mm, 4.15±0.46mm, 16.01±0.91mm and 43.77±1.33D respectively. Axial length, lens thickness and vitreous chamber depth demonstrated a significant positive increase with age while anterior chamber depth and cornea power decreased with age. CONCLUSION: Ocular biometric values in adults of South Western Nigeria were comparable to previous documentations and had significant variation with age.
RESUMO
AIMS AND OBJECTIVES: To objectively assess the visual acuity of commercial motor drivers (CMD) in 3 Local Government Areas (LGA) of Ogun State of Nigeria in order to determine their eligibility to drive. SUBJECTS AND METHODS: The visual acuities of CMDs in 3 LGAS of Ogun state in Nigeria (selected using a multistage sampling technique) were tested with Snellens acuity charts and the eyes examined with bright pen torches and ophthamoscopes. Visual acuity 6/12 or better in the worse eye was taken as adequate to obtain a driving license. The drivers with worse visual acuities were further examined to find the cause of decreased vision. RESULTS: The visual acuities of 524 drivers were determined and analyzed. Their ages ranged from 19-66 years with a mean of 46.8 ±7.2 years. Two hundred and twenty (41.9%) of the drivers were between 40 and 49 years old. Four hundred and four (77.1%) did not have any form of eye test prior to this study. Four hundred and sixty three drivers (88.4%) were eligible to drive while 61 drivers (11.6%) were not eligible. Decreased visual acuity was caused by refractive error in 22(36.1%), cataract in 19(31.2%), glaucoma in 12(19.7%), corneal scar in 5(8.2%) and posterior segment lesions in 3(4.9%). CONCLUSION: Objective assessment of vision should be an essential component of licensure. Middle aged and elderly drivers are prone to age related ocular diseases and require reassessment of visual status every 3 years when licenses are renewed.
